diff --git a/testsuite/driver/testlib.py b/testsuite/driver/testlib.py
index e47fc1c1ab70091498b31ce0de873fd30fd7ddac..409d4fe81f278b4060885c68c4e2befd0a6a79d8 100644
--- a/testsuite/driver/testlib.py
+++ b/testsuite/driver/testlib.py
@@ -330,6 +330,12 @@ def _cmd_prefix( opts, prefix ):
 def normalise_slashes( opts ):
     opts.extra_normaliser = normalise_slashes_
 
+def normalise_fun( fun ):
+    return lambda opts, f=fun: _normalise_fun(opts, f)
+
+def _normalise_fun( opts, f ):
+    opts.extra_normaliser = f
+
 # ----
 # Function for composing two opt-fns together
 
@@ -1181,6 +1187,9 @@ def normalise_errmsg( str ):
     #    hacky solution is used in place of more sophisticated filename
     #    mangling
     str = re.sub('([^\\s])\\.exe', '\\1', str)
+    # The inplace ghc's are called ghc-bin-stage[123] to avoid filename
+    # collisions, so we need to normalise that to just "ghc"
+    str = re.sub('ghc-bin-stage[123]', 'ghc', str)
     return str
 
 def normalise_slashes_( str ):
diff --git a/testsuite/tests/ghc-regress/driver/all.T b/testsuite/tests/ghc-regress/driver/all.T
index 989616f4959c680a3a7b4670d4d02581eaa55734..253239c0f8711ba9eb3fcd84c5f452aa7e5c1b44 100644
--- a/testsuite/tests/ghc-regress/driver/all.T
+++ b/testsuite/tests/ghc-regress/driver/all.T
@@ -192,7 +192,9 @@ test('driver200', normal, run_command,
      ['$MAKE -s --no-print-directory test200'])
 cleanall()
 
-test('2566', normal, run_command,
+test('2566',
+     normalise_fun(normalise_errmsg),
+     run_command,
      ['$MAKE -s --no-print-directory 2566'])
 cleanall()